Malicious PDF — malware analysis report

Static analysis result for SHA-256 16de097601560138…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 09:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 808fe97765c168559e38c52d93374d1d SHA-1: 2ca72ae8b176faa0367fe24d0402bb2b0a9c1b48 SHA-256: 16de09760156013844754c376b9b53786c0da67d9bb73ae36a3ea2e2fd5bdf7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may impersonate official communications to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=ruet+admission+result+2018+pdf PDF link annotation
    • http://casaledellasignora.it/userfiles/files/55435007876.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nezokexemowapinunew.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8443bd96---pokaxexalivavofojenenuv.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/nemonalekazidabipavegewe.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/83671866507.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/6c9021e3e8f180d2fedf63cf4479f13e/93284522962.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/lemunuvevuxivujenamupi.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/13240769198.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/jitorodu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2d65cb5f39c82e9c1b8a251085355e8c/loxoduxi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd4735094---64341816000.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/xudiw.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7cqjsuf5mulosgv8iemcrda413/30561969296.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/lewibena.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/81a1e6f6c8235ce70995b5f329324e77/1849532906.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/75865153817.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/ginosasukasimed.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/jarub.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/52677911524.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/19720160971.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d5817f89de99c5fd21fb09485e28ca5d/5068564106.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/h2o1frvb902eha0276utbspo44/30773085493.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/midotewofuvezase.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 11304 bytes
SHA-256: 25567af8debf953ea4337c5ba712c854960a81cbad03d8254992b414f0d4121d
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 19892 bytes
SHA-256: b9454a7784ae7de93b57d61c481bc3a3f0539cbc12e028762e6b716bf097a048
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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